Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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When dragonflies mate, their tails form a love heart.
22
The Basenji dog is the only dog that is not able to bark.
4
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11
Rattlesnake mating sessions have been known to last more than 22 hours.
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